This article refers to the original Ziptorrent C++ Bittorrent client, and the 2007 version of Azureus modified specifically by MediaDefender Inc. to disrupt Bittorrent downloads.
ZipTorrent was a BitTorrent client written entirely using C++ with the intention of being small and fast. The last known version, 1.3.7.3, was released in 2005, and development has stopped.